JP7619077B2 - Sound signal processing device and control method thereof - Google Patents

Description

The present invention relates to a sound signal processing device and a control method thereof.

Conventionally, there is known a technology that performs binaural processing on sound signals to reproduce a sense of realism as if the listener were actually present when listening through headphones. However, sounds that have been binaurally processed can sound unnatural when heard through speakers. Therefore, a technology has been disclosed that switches the sound tone depending on the connected device (Patent Document 1). For example, in Patent Document 1, when a specific tone is output from headphones, a binaural tone suitable for the headphones is output.

JP 2018-10214 A

However, users do not always want to apply binaural processing. Even when listening through headphones, they may not want binaural processing applied.

One object of the present invention is to provide a sound signal processing device and a control method thereof that can output binaurally processed sound only to appropriate output destinations when binaural processing is enabled.

According to one aspect of the present invention, there is provided a method for controlling sound signal processing, comprising: selecting an output destination of a sound signal from a mix bus from at least a first output destination and a second output destination; performing a first processing including at least a binaural processing on the first sound signal to generate a second sound signal and outputting the second sound signal to the mix bus; setting enable/disable of the binaural processing in the first processing; and , when the second output destination is selected, substantially disabling the application of at least the binaural processing of the first processing to the first sound signal ; performing a second processing on a third sound signal having a different number of channels from the first sound signal to generate a fourth sound signal, and outputting the fourth sound signal to the mix bus .

According to one aspect of the present invention, when binaural processing is enabled, sound that has been subjected to binaural processing can be output only to appropriate output destinations.

FIG. 2 is a block diagram of a sound signal processing device. FIG. 2 is a block diagram showing a configuration relating to signal processing. FIG. 2 is a detailed block diagram of a processing unit. FIG. 2 is a diagram showing a signal flow in a binaural conversion unit. FIG. 2 is a diagram showing a detailed configuration of DeEsser. 4 is a flowchart showing signal processing.

The following describes an embodiment of the present invention with reference to the drawings.

Fig. 1 is a block diagram of a sound signal processing device according to an embodiment of the present invention. The sound signal processing device 100 is configured as a mixer device as an example. The sound signal processing device 100 has a CPU 11, which exchanges information with multiple components via a bus 10. The sound signal processing device 100 has a ROM 12, a RAM 13, a storage unit 14, a display unit 15, and a setting operation unit 16. The sound signal processing device 100 also has various interfaces for connecting external devices, and signals are input and output between the connected external devices and the CPU 11 via the various interfaces. The various interfaces include a communication unit 17, a first microphone input terminal 18, a second microphone input terminal 19, an AUX terminal 20, a USB terminal 21, an HDMI (registered trademark) input terminal 22, an HDMI output terminal 23, a headphone output terminal 24, and a speaker output terminal 25.

A timer (not shown) is connected to the CPU 11. The CPU 11 controls the entire device. The ROM 12 stores the control program executed by the CPU 11, various table data, etc. The RAM 13 stores various data. The memory unit 14 stores various application programs including the control program and various data. The setting operation unit 16 accepts input of various information from the user. The display unit 15 displays various information. The communication unit 17 may include a LAN interface or a MIDI (Musical Instrument Digital Interface).

An external microphone can be connected to the first microphone input terminal 18 and the second microphone input terminal 19. For example, a first microphone 26 is connected to the first microphone input terminal 18, and a second microphone 27 set with a headphone 31 is connected to the second microphone input terminal 19. A communication terminal device 28 such as a smartphone is connected to the AUX terminal 20. A USB device, for example, a PC 29 which is a personal computer, is connected to the USB terminal 21. An HDMI device can be connected to the HDMI input terminal 22 and the HDMI output terminal 23. For example, a game device 30 is connected to the HDMI input terminal 22, and a display monitor 42 is connected to the HDMI output terminal 23. A headphone 31 is connected to the headphone output terminal 24. A speaker 32 is connected to the speaker output terminal 25. The speaker 32 is not limited to a two-channel speaker, but may be a surround speaker, and the number of sound channels is, for example, eight channels (7.1ch).

Figure 2 is a block diagram showing the configuration related to signal processing in the sound signal processing device 100. The sound signal processing device 100 includes processing units A, B, and C, a mix bus 34, and switching units 33 and 35. The functions of processing units A, B, and C are realized mainly by cooperation of the CPU 11, ROM 12, and RAM 13 in addition to the necessary hardware. The operations of the mix bus 34 and switching units 33 and 35 are controlled by the CPU 11.

The signal Sd generated by the game device 30 and input from the HDMI input terminal 22 is output to the HDMI output terminal 23 and supplied to the display monitor 42. The signal Sd includes a video signal, and a video based on the signal Sd is displayed on the display monitor 42. The signal Sd may also include a sound signal, and when an audio device is connected to the HDMI output terminal 23, sound based on the signal Sd is generated from the audio device.

A sound signal generated by the game device 30 and input from the HDMI input terminal 22, or a sound signal generated by the PC 29 and input from the USB terminal 21, is input to the processing unit A as a sound signal Sc. The sound signal Sc is a sound signal with three or more channels, and in this embodiment, it is an eight-channel signal. The processing unit A performs processing A (described later) on the sound signal Sc to generate a sound signal Sg, and outputs the sound signal Sg to the mix bus 34.

A sound signal generated by the communication terminal device 28 and input from the AUX terminal 20, or a sound signal generated by the PC 29 and input from the USB terminal 21, is input to the processing unit B as a sound signal Sb. An example of the sound signal Sb is a voice chat sound signal. The sound signal Sb is generated, for example, by application software executed on the communication terminal device 28 or the PC 29. The processing unit B performs processing B on the sound signal Sb to generate a sound signal Sf, and outputs the generated sound signal Sf to the mix bus 34.

The switching unit 33 exclusively selects between the sound signal collected by the first microphone 26 and input from the first microphone input terminal 18, and the sound signal collected by the second microphone 27 and input from the second microphone input terminal 19. For example, the microphone input terminal to which a microphone is connected is selected, and when microphones are connected to both microphone input terminals, the second microphone input terminal 19 is preferentially selected. The switching unit 33 then outputs the sound signal from the selected microphone input terminal to the processing unit C as a sound signal Sa.

The processing unit C applies C processing to the sound signal Sa to generate a sound signal Se and outputs the sound signal Se to the mix bus 34. The C processing includes, for example, effects and level adjustment. Furthermore, the processing unit C outputs the generated sound signal Se to the AUX terminal 20 and the USB terminal 21. At this time, processing such as D/A conversion and two-channelization may be performed. Therefore, the sound signal Se is output to the communication terminal device 28 and the PC 29 connected to the AUX terminal 20 and the USB terminal 21, respectively. Depending on the settings of the communication terminal device 28 and the PC 29, a sound corresponding to the sound signal Se is generated.

Note that the A process, the B process, and the C process are different processes. Also, although the sound signal Sa is said to be input from a microphone, it may be a signal input from a system other than the input system of the sound signal Sc. Also, the output destination of the sound signal Se that is output without passing through the mix bus 34 (connected to the AUX terminal 20 or the USB terminal 21) may be different from the output destination of the sound signal Sh (connected to the headphone output terminal 24 or the speaker output terminal 25).

The mix bus 34 mixes at least the sound signal Sg and the sound signal Sf to generate the sound signal Sh. In this embodiment, the sound signal Sg, the sound signal Sf, and the sound signal Se are mixed to generate the sound signal Sh. The mix bus 34 outputs the sound signal Sh to the headphone output terminal 24 or the speaker output terminal 25 via the switching unit 35. Here, the sound signal Sh includes a signal Sh-1 for headphones and a signal Sh-2 for speakers. The switching unit 35 exclusively selects the output destination of the sound signal Sh (described later).

Figure 3 is a detailed block diagram of processing unit A. Processing unit A consists of a front-stage processing unit A-1 and a back-stage processing unit A-2. Processing A consists of binaural processing by the front-stage processing unit A-1 and ambient sound emphasis processing by the back-stage processing unit A-2. Front-stage processing unit A-1 includes a binaural processing unit 36. Back-stage processing unit A-2 includes an MS conversion unit 37, DeEssers 38 and 44, PEQ 43 and 39, an LR conversion unit 40, and a PEQ 41. The PEQs 43, 39, and 41 are all, as an example, 4-band parametric equalizers. However, the PEQs 43, 39, and 41 do not have to be 4-band, and do not have to be PEQs, and may be, for example, graphic equalizers (GEQs).

Figure 4 is a diagram showing the flow of signals in the binaural conversion unit 36. As an example, the sound signal Sc is an audio signal composed of 7.1ch (C: center, L: front left, R: front right, SL: surround left, SR: surround right, BL: surround back left, BR: surround back right, LFE: subwoofer).

The Head Related Transfer Function (HRTF) is an impulse response that expresses the difference in the volume, arrival time, and frequency characteristics of sound from a virtual speaker installed at a certain position to the left and right ears. For signals other than the LFE, an HRTF and reverb corresponding to each signal are applied. Reverb is applied to reproduce the sense of distance from the sound source. However, since it is difficult to sense the position of the LFE, HRTF and reverb are not applied. The 8-channel sound signal Sc is stereo-converted through binaural processing by the binaural conversion unit 36, that is, it is converted into a two-channel stereo signal of L and R. This stereo signal is input as the sound signal Si to the MS conversion unit 37 in the post-processing unit A-2.

In the post-processing unit A-2 (FIG. 3), the MS conversion unit 37 generates a sum signal Sj and a difference signal Sk from the sound signal Si. If the left signal of the sound signal Si is represented by L and the right signal by R, the sum signal Sj is calculated by Sj = (L of Si)/2 + (R of Si)/2. The difference signal Sk is calculated by Sk = (L of Si)/2 - (R of Si)/2.

Figure 5 is a diagram showing the detailed configuration of DeEsser 38. Since the configuration and operation of DeEssers 44 and 38 are the same, DeEsser 38 will be described as a representative. DeEsser 38 is equipped with an HPF (high pass filter), LPF (low pass filter), COMP (compressor), etc., and processes sum signal Sj to reduce the sound pressure in the midrange to generate sum signal Sp. DeEsser 44 processes difference signal Sk to reduce the sound pressure in the midrange to generate difference signal Sq.

The PEQ 43 generates a processed sum signal Sl by processing the sum signal Sp to increase the sound pressure in a specified band. The PEQ 39 generates a processed difference signal Sm by processing the difference signal Sq to increase the sound pressure in a specified band.

For example, when playing a shooting game, the DeEsser 38 reduces the sound of gunfire caused by the game user's operation, reducing the noise. Furthermore, the PEQ 39 emphasizes side sounds, making it easier to hear footsteps of a shooting enemy. Therefore, the specified band is not limited, but it is desirable to have a frequency band that is easy to sense directionality and that mainly includes surrounding sounds, in order to make it easier to hear surrounding sounds. Note that by providing the DeEsser and PEQ to both the system of the sum signal Sj and the system of the difference signal Sk, it becomes easy to align the phase of the processed sum signal Sl and the processed difference signal Sm. However, if the effect of phasing is not required, the DeEsser 44 and the PEQ 43 may be eliminated.

The LR conversion unit 40 generates a sound signal Sn by converting the processed sum signal Sl and the processed difference signal Sm into a stereo signal. If the left signal of the sound signal Sn is represented by L and the right signal by R, the L signal of the sound signal Sn is calculated by Sl+Sm. The R signal of the sound signal Sn is calculated by Sl-Sm. The PEQ 41 increases or decreases the sound pressure of each band for the sound signal Sn according to the settings. As a result, a sound signal Sg with adjusted overall sound quality is output from the processing unit A. Note that it is not essential to provide the PEQ 41.

The B processing performed by processing unit B (Figure 2) on sound signal Sb includes, as an example, binaural processing for voice chat. For example, at least one of HRTF and reverb is applied to sound signal Sb to generate sound signal Sf, which is a stereo signal. Note that CPU 11 may switch between applying HRTF and reverb in response to a switching instruction from the user. There may also be cases where neither HRTF nor reverb is applied in response to a switching instruction from the user.

The detailed operation of the switching unit 35 (Figure 2) will be described. The headphone output terminal 24 is a terminal (such as a stereo pin jack or USB terminal) into which a plug (not shown) extending from stereo headphones 31 is inserted. When the plug is inserted into the headphone output terminal 24, a corresponding detection signal is sent to the CPU 11. In response to the detection signal, the CPU 11 determines whether the headphones 31 are connected to the headphone output terminal 24. The output destination may be specified by the user operating the setting operation unit 16. In that case, it is not necessary to configure the system so that a detection signal is sent in response to plug insertion, and the CPU 11 selects the output destination based on the user's specification.

As described above, the switching unit 35 exclusively selects the output destination of the sound signal Sh under the control of the CPU 11. For example, when the headphones 31 are connected to the headphone output terminal 24, the headphone output terminal 24 is selected as the output destination, and when the headphones 31 are not connected to the headphone output terminal 24, the speaker output terminal 25 is selected as the output destination. When the headphone output terminal 24 is selected, the headphone signal Sh-1 is output to the headphones 31. When the speaker output terminal 25 is selected, the speaker signal Sh-2 is output to the speaker 32. When the switching unit 35 outputs the sound signal Sh, level adjustment and D/A conversion may be performed. In particular, when the headphone signal Sh-1 is output, adjustment of the output characteristics to match the headphones may also be performed.

The user also inputs a setting instruction to enable or disable the binauralization process using the setting operation unit 16 as a setting unit. The CPU 11 sets the binauralization process by the binauralization unit 36 (FIG. 3) to be enabled/disabled in accordance with the instruction from the user via the setting operation unit 16. The setting state of the binauralization process to be enabled/disabled is stored in the RAM 13. The binauralization process by the binauralization unit 36 is actually applied only if the binauralization process is set to "enabled." If the binauralization process is set to "disabled," the binauralization process is not applied.

The CPU 11 controls whether the application of binaural processing by the binauralization unit 36 is enabled/substantially disabled. The CPU 11 enables or substantially disables the application of binaural processing based on the setting state of the binaural processing and the determination state of whether the headphones 31 are connected to the headphone output terminal 24. For example, when disabling the application of binaural processing, the CPU 11 inputs the sound signal Si to the MS conversion unit 37 through a downmix unit (not shown) instead of the binauralization unit 36. In the downmix unit (not shown), the 8ch sound signal Si is simply downmixed to a 2ch signal of L/R.

Alternatively, the following method may be adopted to disable or substantially disable (substantially not apply) the application of binauralization processing. First, in normal binauralization processing by the binauralization unit 36, filter coefficients of multiple taps in the equation are set when realizing HRTF. The degree of application of binauralization processing may be weakened by adjusting the filter coefficients of the multiple taps. That is, the CPU 11 differs the parameters in the binauralization processing when substantially disabling the application of binauralization processing compared to when enabling the application of binauralization processing. Note that setting the filter coefficients of all taps except one of the multiple taps to 0 is equivalent to disabling (stopping) the application of binauralization processing. From this perspective, the concept of "substantially disabled" may include not only stopping the application of binauralization processing, but also a process of weakening the degree of application of binauralization processing.

Figure 6 is a flowchart showing signal processing. This processing is realized by the CPU 11 expanding a program stored in the ROM 12 into the RAM 13 and executing the program. This processing is started when the sound signal processing device 100 is turned on or transitions to the signal output mode.

First, in step S101, the CPU 11 determines whether the output destination of the sound signal Sh is the headphone output terminal 24 (headphones 31). For example, as described above, if the headphones 31 are connected to the headphone output terminal 24, the headphone output terminal 24 is determined as the output destination. Note that, as described above, if the output destination is specified by a user operation, the output destination is determined based on that specification. If the output destination of the sound signal Sh is the headphone output terminal 24, the CPU 11 proceeds to step S102. On the other hand, if the output destination of the sound signal Sh is not the headphone output terminal 24, the output destination is the speaker output terminal 25 (speaker 32), and the CPU 11 proceeds to step S107.

In step S102, the CPU 11 refers to the enabled/disabled setting state of the binaural processing stored in the RAM 13, and determines whether the binaural processing setting is "enabled." If the binaural processing setting is not "enabled," the CPU 11 advances the process to step S107. If the binaural processing setting is "enabled," the CPU 11 advances the process to step S103.

In step S103, as described above, in process A, the binauralization unit 36 (FIG. 3) applies the binauralization process as usual. On the other hand, in step S107, the CPU 11 essentially disables (including stops application of) the binauralization process by the binauralization unit 36 in process A. After steps S103 and S107, the CPU 11 advances the process to step S104.

In step S104, the CPU 11 determines whether the output destination of the sound signal Sh is the headphone output terminal 24 (headphones 31). If the output destination of the sound signal Sh is the headphone output terminal 24, in step S105, the CPU 11 switches the signal output destination in the switching unit 35 to the headphone output terminal 24, and outputs the headphone signal Sh-1 from the headphone output terminal 24 to the headphones 31. The headphone signal Sh-1 is a sound signal in which the sound signal Sg and the sound signal Sf that have been subjected to binaural processing are mixed. Therefore, the user can hear a realistic sound through the headphones 31. After step S105, the CPU 11 advances the process to step S106.

If the result of the determination in step S104 is that the output destination of the sound signal Sh is not the headphone output terminal 24, the output destination is the speaker output terminal 25 (speaker 32), and the CPU 11 advances the process to step S108. In step S108, the CPU 11 switches the output destination of the signal in the switching unit 35 to the speaker output terminal 25, and outputs the speaker signal Sh-2 from the speaker output terminal 25 to the speaker 32. The speaker signal Sh-2 is a sound signal that is a mixture of the sound signal Sg and the sound signal Sf that have not been substantially subjected to binaural processing. Therefore, the user can hear a natural sound from the speaker 32. After step S108, the CPU 11 advances the process to step S106.

In step S106, the CPU 11 executes other processes and returns the process to step S101. In other processes, for example, various instructions from the user, such as an instruction to enable/disable the binaural processing, are accepted, and processes are executed in response to the various instructions. In addition, if the device power is turned off or an instruction to end the signal output mode is received, the CPU 11 ends the process shown in FIG. 6.

According to this embodiment, the switching unit 35 as a selection unit selects the output destination of the sound signal from the mix bus 34 from at least the headphones 31 (first output destination) and the speaker 32 (second output destination). The processing unit A (first processing unit) performs A processing (first processing) including at least binaural processing on the sound signal Sc (first sound signal) to generate a sound signal Sg (second sound signal) and outputs the sound signal Sg to the mix bus 34. The enable/disable of the binaural processing in the A processing is set according to a user operation. When the binaural processing is set to be enabled and the headphones 31 is selected as the output destination, the CPU 11 as a control unit normally applies the binaural processing to the sound signal Sc in the A processing. When the speaker 32 is selected as the output destination, the CPU 11 substantially disables the application of at least the binaural processing of the A processing to the sound signal Sc even if the binaural processing is set to be enabled. Therefore, when binaural processing is enabled, sound that has been subjected to binaural processing can be output only to the appropriate output destination, the headphones 31.

For example, the CPU 11 stops applying binaural processing to the sound signal Sc. Alternatively, when the CPU 11 effectively disables the application of binaural processing compared to when the application of binaural processing is enabled, the CPU 11 weakens the degree of application of the binaural processing by varying the parameters in the binaural processing. Through these processes, a sound signal that is not essentially binaurally processed can be output to the speaker 32, and a natural sound can be output.

Furthermore, processing unit B (second processing unit) performs B processing (second processing) on sound signal Sb (third sound signal) which has a different number of channels from sound signal Sc (first sound signal) to generate sound signal Sf (fourth sound signal), and outputs sound signal Sf to mix bus 34. Since sound signal Sf is mixed with sound signal Sg and output to the selected output destination, it is possible to output another sound signal with a different number of channels, such as voice chat audio, together. Note that B processing does not necessarily have to include binaural processing.

In addition, since the first output destination and the second output destination are selected exclusively, it is possible to clearly distinguish whether or not to actually apply binaural processing depending on the output destination.

Note that the first output destination is the headphones 31, but since the headphones 31 are an example of an ear-worn sound output device, the first output destination may also be earphones. Therefore, the headphone signal Sh-1 that has been binaurally processed as usual can be output only to the ear-worn sound output device.

Note that it is not essential to provide the processing unit C. Therefore, the sound signal Sh may be a signal that is a mixture of the sound signals Sg and Sf, without including the sound signal Se. Note that it is not essential to provide the post-processing unit A-2 in the processing unit A, so long as it is only to obtain the effect of outputting sound that has been subjected to binaural processing only to an appropriate output destination when the binaural processing is set to be enabled. Note that the source of acquisition of the sound signal Sa is not limited to a microphone.

The present invention has been described in detail above based on preferred embodiments, but the present invention is not limited to these specific embodiments, and various forms that do not deviate from the gist of the invention are also included in the present invention.

The same effect as the present invention may be achieved by reading a storage medium storing a control program represented by software for achieving the present invention into the sound signal processing device 100. In that case, the program code itself read from the storage medium realizes the novel function of the present invention, and the non-transient computer-readable recording medium storing the program code constitutes the present invention. The program code may also be supplied via a transmission medium, in which case the program code itself constitutes the present invention. In addition to ROM, the storage medium in these cases may be a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a non-volatile memory card, or the like. Non-transient computer-readable recording media also include those that hold a program for a certain period of time, such as a volatile memory (e.g., DRAM (Dynamic Random Access Memory)) inside a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line.

A, B, C Processing section, Sc, Sg Sound signal, 11 CPU, 31 Headphones, 32 Speaker, 34 Mix bus, 35 Switching section

Claims (18)

selecting an output destination of the sound signal from the mix bus from at least a first output destination and a second output destination;
performing a first process including at least a binaural process on the first sound signal to generate a second sound signal, and outputting the second sound signal to the mix bus;
Set whether or not binaural processing in the first processing is enabled;
When the second output destination is selected , application of at least the binaural processing of the first processing to the first sound signal is substantially disabled ;
A control method for a sound signal processing device , comprising: performing second processing on a third sound signal, the third sound signal having a different number of channels from the first sound signal, to generate a fourth sound signal; and outputting the fourth sound signal to the mix bus . The control method for the sound signal processing device according to claim 1, wherein, when the second output destination is selected and the binaural processing is enabled, at least the binaural processing of the first processing is stopped. The control method for a sound signal processing device according to claim 1, wherein, when the first output destination is selected and the binaural processing is enabled, a parameter in at least the binaural processing of the first processing is made different when the second output destination is selected and the binaural processing is enabled. The method of controlling a sound signal processing device according to claim 1 , wherein the mix bus mixes the second sound signal and the fourth sound signal and outputs the mixed signal to a selected output destination. the first output destination is a headphone or an earphone,
The method for controlling a sound signal processing device according to claim 1 , wherein the second output destination is a speaker. The method of claim 1 , wherein the first output destination and the second output destination are exclusively selected. The method of claim 1 , wherein the binaural processing in the first process is enabled/disabled in response to a user operation. The method for controlling a sound signal processing device according to claim 1 , wherein the third sound signal is a sound signal for voice chat. The method for controlling a sound signal processing device according to claim 8 , wherein the second processing includes binaural processing for voice chat. The method of claim 9 , wherein the binaural processing in the second processing is enabled/disabled in response to a user operation. The binauralization process in the second processing includes at least one of application of a head-related transfer function or application of a reverb to the third sound signal,
The method of claim 9 , further comprising the step of switching whether the head related transfer function or the reverb is applied in response to a user operation. Mix bus and
a selection unit that selects an output destination of an audio signal from the mix bus from at least a first output destination and a second output destination;
a first processing unit that performs a first process including at least a binaural process on a first sound signal to generate a second sound signal, and outputs the second sound signal to the mix bus;
A setting unit that sets whether or not a binaural process in the first process is enabled;
a control unit that, when the second output destination is selected by the selection unit , substantially disables application of at least the binaural processing of the first processing to the first sound signal;
a second processing unit that performs a second process on a third sound signal having a different number of channels from the first sound signal to generate a fourth sound signal, and outputs the fourth sound signal to the mix bus;
A sound signal processing device comprising: The sound signal processing device according to claim 12 , wherein the control unit stops at least the binaural processing of the first processing when the second output destination is selected and the binaural processing is set to enabled. 13. The sound signal processing device according to claim 12, wherein the control unit changes a parameter in at least the binaural processing of the first processing when the first output destination is selected and the binaural processing is enabled, whereas when the second output destination is selected and the binaural processing is enabled, the control unit changes a parameter in at least the binaural processing of the first processing. The sound signal processing device according to claim 12 , wherein the mix bus mixes the second sound signal and the fourth sound signal and outputs the mixed signal to a selected output destination. the first output destination is a headphone or an earphone,
The sound signal processing device according to claim 12 , wherein the second output destination is a speaker. The sound signal processing device according to claim 12 , wherein the first output destination and the second output destination are exclusively selected. The sound signal processing device according to claim 12 , wherein the binaural processing in the first processing is enabled/disabled in response to a user operation.

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